PENGARUH PENGGUNAAN BAHAN GROUTING KOMBINASI SEMEN DAN KAPUR PADA TANAH LEMPUNG TERHADAP NILAI DAYA DUKUNG DAN PENURUNAN

The problems in the soil is often an obstacle in a construction activity, one of which is land subsidence. The purpose of this study was to analyze the physical and mechanical properties of clay soil and to analyze value of bearing capacity soil and value of settlement consolidation of the clay after grouting. Soil improvement method in this study is grouting using portland cement and activated lime. Variations will be used are 2 points grouting combination of cement and lime (d = 1 cm) and 4 points grouting combination of cement and lime (d = 0,75 cm). Point diameters are made different so that the total surface area of the sample is same. All samples will be cured for 3 days. The results of physical test, based on AASHTO classification, the soil is in group A-7-6 (6) (clay soil) with moderate to bad condition and USCS system soil is in the CL group. The results of clay soil consolidation test without grouting, Sc = 0,243 cm. Variation 2 points combined grouting, Sc = 0,174 cm and variation 4 points combined grouting, Sc = 0,159 cm. Value bearing capacity of clay without grouting (q ult ) = 4,9053 kg/cm 2 . Variation 2 points combined grouting, the value of bearing capacity (q ult ) = 7,8070 kg/cm 2 and variations 4 points combined grouting, value of bearing capacity (q ult ) = 12,9126 kg/cm 2 . From the test results, it can be concluded that grouting increases the value of the bearing capacity and reduces the value settlement of clay soil.